Response.Output.Write can format a string, this actually is kind of like sprintf in other languages.

The things in {0} is kind of a backreference per say. The {0} means the first argument after this one, meaning f. The {1} indicates the next one, which is ToCelsius(f), and I believe you can have up to {2} in most cases.

So, if in the above, every {0} just means INSERT f there.

THe second one is {1:f}. The 1 is self-explanatory, insert the ToCelsius(f) there, but the f I believe is to make ToCelsius(f) a float, but I'm not sure...

Someone recently asked me about how to display a progress indicator on a page while an iframe is loading. And I remember when I first came across this myself. It was a bit tricky to get my head around, but really, it's very simple.
The most impor…

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